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Lunna [17]
3 years ago
5

Write two ways to group and add 4+7+2

Mathematics
1 answer:
saul85 [17]3 years ago
4 0

Answer:

Two ways you can group them is:

(4+7)+2

4+(7+2)

They will both give you the same answer of 13.

(4+7)+2                  4+(7+2)

11+2= 13                 4+9= 13

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Two friends Ana and Juan are buying books by joining the History Book
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Answer:

Ana  spent $17  per book on average.

Juan  spent $14.78  per book on average.

y = $15 + 17x--------- equation 1

y= $10 + 14.78 x------------- equation 2

Step-by-step explanation:

Ana has to pay a yearly fee of $15 to join.

She spends a total of $525 for 30 books.

The amount spent on books = Total amount - yearly fee

                                                 = $525- $15= $510

Price per book on the average = $510/30= $ 17

Ana  spent $17  per book on average.

Juan has to pay a yearly fee of $10 to join.

He spends a total of $350 for 23 books.

The amount spent on books = Total amount - yearly fee

                                                 = $350- $10= $340

Price per book on the average = $340/23= $ 14.78≅ $15

Juan  spent $14.78  per book on average.

The function can be established if y gives the total cost and x gives the number of books

y = $15 + 17x--------- equation 1

y= $10 + 14.78 x------------- equation 2

Juan has a better deal because the yearly fee is less also the price per book is less.

8 0
3 years ago
Write the following:<br>a) 16 as a fraction of 152<br>b) 15 as a fraction of 210<br>​
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Answer:

\frac{16}{152}

\frac{15}{210}

Step-by-step explanation:

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The answer is x=4 or x= minus 5 i mean D.
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Answer:

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Step-by-step explanation:

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